Bone Support provides a full spectrum of bone density supporting minerals and co-factors. Highly bioavailable vitamin D3 (1,000 IU) is added to enhance calcium utilization in the body. Just four capsules provide 1,000 mg of calcium from a fast-absorbing calcium blend which includes 600 mg of calcium citrate. The calcium is then balanced in an optimal 2:1 ratio with magnesium. Boron is included since research shows boron helps you utilize calcium better.* Take 4 capsules daily.